JP2821431B2 - Control channel frequency switching method in mobile communication system - Google Patents
Control channel frequency switching method in mobile communication systemInfo
- Publication number
- JP2821431B2 JP2821431B2 JP8164256A JP16425696A JP2821431B2 JP 2821431 B2 JP2821431 B2 JP 2821431B2 JP 8164256 A JP8164256 A JP 8164256A JP 16425696 A JP16425696 A JP 16425696A JP 2821431 B2 JP2821431 B2 JP 2821431B2
- Authority
- JP
- Japan
- Prior art keywords
- control channel
- mobile communication
- communication system
- interference
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Monitoring And Testing Of Transmission In General (AREA)
- Mobile Radio Communication Systems (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は移動体通信システム
における制御チャネルの切替方法に関し、特に使用中の
制御チャネルに干渉障害が発生したときの制御チャネル
周波数切替方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control channel switching method in a mobile communication system, and more particularly to a control channel frequency switching method when an interference failure occurs in a control channel being used.
【０００２】[0002]
【従来の技術】移動体通信システムにおいては、発呼あ
るいは着呼ならびに位置登録など呼処理全般に関わる制
御はすべて制御チャネルを用いて行われており、制御チ
ャネルはシステムの運用上非常に重要な役割を果たして
いる。従来、セルあるいはセクタ単位に制御チャネルを
配置した移動体通信システムでは、制御チャネルのため
に使用される装置、たとえば、送受信機を含む無線機お
よびこの無線機に対応するチャネル中継器をそれぞれ常
用機、予備機の二重化冗長構成とし、常用機がハードウ
ェア障害になった場合、制御部（図示せず）が障害情報
を受信したときには、切替スイッチ（図示せず）を制御
し、予備機側の無線機およびチャネル中継器に切替え
て、常用機側と同一周波数の制御チャネルで継続運用す
る構成となっている。2. Description of the Related Art In a mobile communication system, all control related to call processing such as outgoing and incoming calls and location registration is performed using a control channel, and the control channel is very important for system operation. Plays a role. 2. Description of the Related Art Conventionally, in a mobile communication system in which a control channel is arranged in units of cells or sectors, a device used for the control channel, for example, a radio including a transceiver and a channel repeater corresponding to the radio are commonly used. In the case where the service unit has a hardware failure and the control unit (not shown) receives the failure information, the control unit (not shown) controls the changeover switch (not shown) to The configuration is such that the operation is switched to the radio device and the channel repeater, and the operation is continuously performed on the control channel having the same frequency as the service device side.
【０００３】[0003]
【発明が解決しようとする課題】この従来の移動体通信
システムにおける制御チャネルの切替では、ハードウェ
ア障害をともなって、常用機側で使用中の制御チャネル
に自システムあるいは他シスムから干渉を受け障害を発
生したとき、予備機側に切替わるが、制御チャネルとし
て同一の周波数帯を割当ててあるので、切替わった時点
でも干渉障害が解消されていない場合には、常用機およ
び予備機両系の制御チャネルが使用できなくなり、その
当該セルあるいはセクタが運用停止になってしまうとい
う問題がある。In the switching of the control channel in the conventional mobile communication system, the control channel being used on the service machine is interfered by the own system or another system with a hardware failure. Occurs, the switch to the standby unit is performed, but since the same frequency band is allocated as the control channel, if the interference failure is not resolved at the time of the switch, both the service unit and the standby unit There is a problem that the control channel becomes unusable and the cell or sector concerned stops operating.
【０００４】本発明の目的は、セルあるいはセクタ単位
に制御チャネルを配置した移動体通信システムで、使用
中の制御チャネルに干渉障害が発生した場合、他の使用
可能な制御チャネルを自動的に再割当てすることによ
り、その当該セルあるいはセクタを継続運用することが
できる移動体通信システムにおける制御チャネル周波数
切替方法を提供することにある。An object of the present invention is to provide a mobile communication system in which control channels are arranged in units of cells or sectors, and when an interference fault occurs in a control channel being used, another available control channel is automatically re-used. It is an object of the present invention to provide a control channel frequency switching method in a mobile communication system capable of continuously operating the cell or the sector by allocating.
【０００５】[0005]
【課題を解決するための手段】本発明の移動体通信シス
テムにおける制御チャネル周波数切替方法は、セルある
いはセクタ単位に制御チャネルを配置した移動体通信シ
ステムで、使用中の制御チャネルに干渉障害が検出され
たら、無線機を予備機側に切替えて接続し、この予備機
側に切替えても干渉障害が解消しないときには、あらか
じめ制御チャネルの予備周波数として設定してある複数
の制御チャネルの空き状況を参照し、この予備周波数の
うち干渉障害を起こさない使用可能な周波数の制御チャ
ネルを選択し、干渉障害を起こした該当のセルまたはセ
クタ単位に再割当てを行う。A control channel frequency switching method in a mobile communication system according to the present invention is a mobile communication system in which control channels are arranged in units of cells or sectors. Then, switch the wireless device to the standby device side and connect it. If the interference failure is not resolved even after switching to the standby device side, refer to the vacant status of a plurality of control channels set in advance as the standby frequency of the control channel. Then, a control channel of an available frequency that does not cause interference is selected from the spare frequencies, and reassignment is performed in units of cells or sectors in which the interference has occurred.
【０００６】[0006]
【発明の実施の形態】次に、本発明の実施の形態につい
て図面を参照して説明する。Next, embodiments of the present invention will be described with reference to the drawings.
【０００７】図１を参照すると、セルラ方式の移動体通
信システムは、セルあるいはセクタ単位に配置した制御
チャネルを送受信するとともに制御チャネルの監視機能
を有する制御チャネル用装置１と、この制御チャネル用
装置１に接続し移動機（図示せず）の呼処理接続制御を
行う交換機２と、制御チャネル用の周波数帯を通過させ
る帯域フイルタ３とを含んで構成される。Referring to FIG. 1, a cellular type mobile communication system transmits and receives control channels arranged in units of cells or sectors, and has a control channel device 1 having a control channel monitoring function, and a control channel device. 1 and an exchange 2 for performing call processing connection control of a mobile station (not shown) and a band filter 3 for passing a frequency band for a control channel.
【０００８】制御チャネル用装置１は、制御チャネル用
の送受信機能を有する無線機１１，１３と、制御チャネ
ルの情報を中継するとともに干渉障害の検出を行うチャ
ネル中継器１２，１４と、無線機およびチャネル中継器
を常用機から予備機に切替接続するスイッチ１５と、チ
ャネル中継器１２，１４で検出された障害情報によりス
イッチ１５に常用／予備の切替指示を送出し交換機２と
制御チャネル上の情報の送受信を行う制御部１６とを備
える。The control channel device 1 includes radio units 11 and 13 having a transmission / reception function for a control channel, channel repeaters 12 and 14 for relaying control channel information and detecting interference failure, A switch 15 for switching and connecting the channel repeater from the service unit to the spare unit, and a service / standby switch instruction is sent to the switch 15 based on the failure information detected by the channel repeaters 12 and 14, and information on the exchange 2 and the control channel is provided. And a control unit 16 for transmitting and receiving data.
【０００９】交換機２には、たとえばＴＡＣＳ（Ｔｏｔ
ａｌ Ａｃｃｅｓｓ Ｃｏｍｍｕｎｉｃａｔｉｏｎ Ｓ
ｙｓｔｅｍ）方式の場合、制御チャネルの干渉障害発生
時の代替としてあらかじめ予備の制御チャネルとし使用
することが可能なその地域に適する２または３の周波数
情報を制御チャネル周波数設定テーブル（図示せず）に
設定しておく。For example, TACS (Tot)
al Access Communication S
system), in the control channel frequency setting table (not shown), two or three pieces of frequency information suitable for the area that can be used as a spare control channel in advance as a substitute for the occurrence of a control channel interference failure are stored. Set it.
【００１０】なお、図１では、無線機１１，チャネル中
継器１２が常用機、無線機１３，チャネル中継器１４が
予備機を示す。In FIG. 1, the wireless device 11 and the channel repeater 12 are service devices, and the wireless device 13 and the channel repeater 14 are standby devices.
【００１１】次に、図１および図２を参照して、本発明
の実施の形態の動作について説明する。無線機１１が所
定の制御チャネルを用いて通信しているときに、チャネ
ル中継器１２は、無線機１１の受信キャリアレベルが所
定のしきい値より高くなり且つこのレベルが一定時間継
続したことを検出し、干渉障害が発生しているものと判
定しこれを認知する（ステップ１：Ｓ１）。つまり、干
渉波が存在しても、しきい値より低い状態が継続しても
障害と認知しない。この干渉障害情報は制御部１６に転
送され、制御部１６は、干渉障害の発生を認識し現在使
用中の無線機１１およびチャネル中継器１２を無線機１
３およびチャネル中継器１４に切替るため、スイッチ１
５に対し切替指示を出し予備機側に切替接続させる（Ｓ
２）。この切替後、チャネル中継器１４は干渉障害がさ
らに継続しているか否かを判定し（Ｓ３）、干渉障害が
起きない場合には、この予備機側で接続処理を続行する
（Ｓ４）。Next, the operation of the embodiment of the present invention will be described with reference to FIGS. When the radio device 11 is communicating using the predetermined control channel, the channel repeater 12 determines that the reception carrier level of the radio device 11 has become higher than the predetermined threshold value and that this level has continued for a certain period of time. Then, it is determined that an interference fault has occurred and recognized (step 1: S1). That is, even if there is an interference wave, even if the state lower than the threshold value continues, it is not recognized as a failure. The interference failure information is transferred to the control unit 16, and the control unit 16 recognizes the occurrence of the interference failure and replaces the currently used wireless device 11 and channel repeater 12 with the wireless device 1.
3 and switch 1 to switch to channel repeater 14.
5 and issues a switching instruction to switch to the spare machine side (S
2). After this switching, the channel repeater 14 determines whether or not the interference fault continues (S3). If no interference fault occurs, the connection processing is continued on the standby side (S4).
【００１２】一方、ステップ３で、予備機側に切替えて
も干渉障害が解消しないことをチャネル中継器１４が検
出したときには、この障害情報を制御部１６を通して交
換機２に転送し、交換機２は、あらかじめ制御チャネル
周波数設定テーブルに設定してある予備周波数の制御チ
ャネルの空き状況を参照する（Ｓ５）。そして、交換機
２は、この予備周波数のうち干渉障害を起こさない使用
可能な周波数の制御チャネルを選択し（Ｓ６）、この選
択した制御チャネルをセルまたはセクタ単位に再割当て
を行う（Ｓ７）。この結果、干渉障害を回避できその当
該セルあるいはセクタの運用を継続できる。On the other hand, in step 3, when the channel repeater 14 detects that the interference failure is not resolved even when switching to the standby device side, the failure information is transferred to the switching device 2 through the control unit 16, and the switching device 2 Reference is made to the availability of the control channel for the spare frequency set in the control channel frequency setting table in advance (S5). Then, the exchange 2 selects a control channel of an available frequency that does not cause interference among the spare frequencies (S6), and reassigns the selected control channel in units of cells or sectors (S7). As a result, interference can be avoided and the operation of the cell or sector concerned can be continued.
【００１３】[0013]
【発明の効果】以上説明したように本発明によれば、セ
ルあるいはセクタ単位に制御チャネルを配置した移動体
通信システムで、使用中の制御チャネルに干渉障害が検
出されたら、無線機を予備機側に切替えて接続し、この
予備機側に切替えても干渉障害が解消しないときには、
あらかじめ制御チャネルの予備周波数として設定してあ
る複数の制御チャネルの空き状況を参照し、この予備周
波数のうち干渉障害を起こさない使用可能な周波数の制
御チャネルを選択し、干渉障害を起こした該当のセルま
たはセクタ単位に再割当てを行うことにより、移動体通
信システムにおける制御チャネルの干渉障害を回避で
き、その当該セルあるいはセクタの運用を停止させるこ
となく継続使用することが可能となる。As described above, according to the present invention, in a mobile communication system in which control channels are arranged in units of cells or sectors, if an interference failure is detected in a control channel being used, the radio is set to a standby unit. If the interference is not resolved even after switching to this standby unit,
Reference is made to the availability of a plurality of control channels that have been set as spare frequencies for the control channels in advance, and a control channel of an available frequency that does not cause interference among the spare frequencies is selected. By performing the reassignment in units of cells or sectors, it is possible to avoid interference of the control channel in the mobile communication system, and to continue using the cells or sectors without stopping the operation.
【図１】本発明の実施の形態を適用する移動体通信シス
テムの関連装置を示すブロック図である。FIG. 1 is a block diagram showing related devices of a mobile communication system to which an embodiment of the present invention is applied.
【図２】本発明の移動体通信システムにおける制御チャ
ネル周波数切替方法の実施の形態の動作を示すフローチ
ャートである。FIG. 2 is a flowchart showing the operation of the embodiment of the control channel frequency switching method in the mobile communication system of the present invention.
１ 制御チャネル用装置 ２ 交換機 ３ 帯域フィルタ １１，１３ 無線機 １２，１４ チャネル中継器 １５ スイッチ １６ 制御部 DESCRIPTION OF SYMBOLS 1 Control channel apparatus 2 Switching device 3 Band-pass filter 11, 13 Radio equipment 12, 14 Channel repeater 15 Switch 16 Control part
フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) H04B 7/26 H04B 17/00 - 17/02 H04Q 7/00 - 7/38Continuation of the front page (58) Field surveyed (Int.Cl. 6 , DB name) H04B 7/26 H04B 17/00-17/02 H04Q 7/00-7/38
Claims (1)
配置した移動体通信システムで、使用中の制御チャネル
に干渉障害が検出されたら、無線機を予備機側に切替え
て接続し、この予備機側に切替えても干渉障害が解消し
ないときには、あらかじめ制御チャネルの予備周波数と
して設定してある複数の制御チャネルの空き状況を参照
し、この予備周波数のうち干渉障害を起こさない使用可
能な周波数の制御チャネルを選択し、干渉障害を起こし
た該当のセルまたはセクタ単位に再割当てを行うことを
特徴とする移動体通信システムにおける制御チャネル周
波数切替方法。In a mobile communication system in which a control channel is arranged in units of cells or sectors, when an interference failure is detected in a control channel being used, a wireless device is switched to a standby device and connected. If the interference is not resolved even after switching to, reference is made to the availability of a plurality of control channels that are set in advance as spare frequencies for the control channels, and control channels of available frequencies that do not cause interference among the spare frequencies And performing a reallocation in units of cells or sectors in which interference has occurred, in the mobile communication system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8164256A JP2821431B2 (en) | 1996-06-25 | 1996-06-25 | Control channel frequency switching method in mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8164256A JP2821431B2 (en) | 1996-06-25 | 1996-06-25 | Control channel frequency switching method in mobile communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1013912A JPH1013912A (en) | 1998-01-16 |
| JP2821431B2 true JP2821431B2 (en) | 1998-11-05 |
Family
ID=15789646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8164256A Expired - Fee Related JP2821431B2 (en) | 1996-06-25 | 1996-06-25 | Control channel frequency switching method in mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2821431B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003244761A (en) * | 2002-02-14 | 2003-08-29 | Fujitsu Ltd | Communication apparatus, communication system, and method for setting communication frequency |
| US7917149B2 (en) * | 2006-08-18 | 2011-03-29 | Fujitsu Limited | System and method for reusing wireless resources in a wireless network |
| WO2012124113A1 (en) | 2011-03-17 | 2012-09-20 | 富士通株式会社 | Wireless base station device, wireless communication method for wireless base station device, and wireless communication system |
-
1996
- 1996-06-25 JP JP8164256A patent/JP2821431B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1013912A (en) | 1998-01-16 |
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